The research paper is thorough, describing the phenomenon, pointing out that this star is unique - we've seen nothing like it. Kepler has collected data on this star steadily for four years. It's not instrumental error. Kepler isn't seeing things; the signal is real.

At first it was thought a swarm of comets. But if that were true the comets would have to be very large and close to the sun in order to be seen. That close in order to effect the sun would mean that the comets would have vaporized thousands of years ago.

It can't be a planet as Kepler would have already determined it to have been a planet .

So what do you think it is?

Hoping for all hopes I am thinking that it is in fact an alien megastructure or at least the floating debris of a structure.

Yes, but wouldn't it be cool, if we OPTICALLY found other civilizations, I hear they are training a radio telescope on it soon to see if signals are present..if any are found, the plan is to use the VLA to give that system a good look...

"The D800 event appears to have been a single transit causing a star brightness drop-off of 15 percent, whereas D1500 was a burst of several transits, possibly indicating a clump of different objects, forcing a brightness dip of up to 22 percent. To cause such dips in brightness, these transiting objects must be huge."

Could it have been some transitory flash or photon burst or "flare" across Kepler's optics, causing the brightness to appear to dip, but in reality, it was a separate phenomenon?

A well known vector model of angular momentum is referred to as the

J-J Coupling

"In light atoms, the interactions between the orbital angular momenta of individual electrons is stronger than the spin-orbit coupling between the spin and orbital angular momenta. These cases are described by "L-S coupling". However, for heavier elements with larger nuclear charge, the spin-orbit interactions become as strong as the interactions between individual spins or orbital angular momenta. In those cases the spin and orbital angular momenta of individual electrons tend to couple to form individual electron angular momenta.

J sub1 = Lsub1 + Ssub1 J = Sigma sub 1 Jsub1
Jsub2 = Lsub2 + Ssub2

Another case where the overall L and S are decoupled is the case where there is a very strong external magnetic field is applied. This is called the Paschen-Back effect."*